Momocs planned upgrades

Now

[ ] generalize validate on printmethods and remove coo_check
[ ] review all graphics
[ ] progress everywhere required
[ ] gpplot2 most of graphics
[ ] increase test coverage
[ ] benchmark and profile and Rcpp-ize core functions where needed
[ ] write a cheatsheet
[ ] review English
[ ] rewrite a proper NEWS.md by digging into GitHub commits
[ ] *_and_back for all morphometric methods
[ ] include default values in #'@param and check #'@return - started in 1.2.5
[ ] add more and/or better examples everywhere - started in 1.2.5
[ ] make Travis deploy /docs

[X] turn calibrate_*(method) into method_calibrate_* - since 1.2.5
[X] try to remove some dependencies - started in 1.2.5 : removed plyr, reshape2
[X] homogeneize messages everywhere
[X] fix all TODOs - most of them
[X] fix all dirty but works and variants - most of them
[X] all possible coo_s that can have it have their Coo methods - since 1.2.5
[x] use progress::progress_bar and remove verbose arg everywhere for an options()
[x] deprecate poorly tested/working/used functions - started in 1.2.5
[x] remove data() everywhere - since 1.2.5
[x] doc with pkgdown - since 1.2.5
[x] prepare ground for MomX
[X] include the layers for multivariate plotters - since 1.2.5
[x] RColorBrewer + viridis
[x] dplyr::data_frame everywhere
[x] morphospaces for LDA - since 1.2.9.1
[x] homogeneize SE/NSE everywhere (with .fac_dispatch) - since 1.2.9